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run code in 300+ PHP versions simultaneously
<?php class T { private $a = array(); public function add($item) { $this->a[] = $item; } public function print() { echo join(', ', $this->a) . "\n"; } } $a = new T(); $a->add(1); $b = clone $a; $b->add(2); $a->print(); $b->print();

preferences:
35.87 ms | 402 KiB | 5 Q